Commit 83177a65 authored by Will Schroeder's avatar Will Schroeder
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ENH:Example demonstrated psuedo volume rendering in non-image data

parent d17a234d
package require vtk
package require vtkinteraction
package require vtktesting
# Perform psuedo volume rendering in a structured grid by compositing
# translucent cut planes. This same trick can be used for unstructured
# grids. Note that for better results, more planes can be created. Also,
# if your data is vtkImageData, there are much faster methods for volume
# rendering.
# Create pipeline. Read structured grid data.
vtkPLOT3DReader pl3d
pl3d SetXYZFileName "$VTK_DATA_ROOT/Data/combxyz.bin"
pl3d SetQFileName "$VTK_DATA_ROOT/Data/combq.bin"
pl3d SetScalarFunctionNumber 100
pl3d SetVectorFunctionNumber 202
pl3d Update
# A convenience, use this filter to limit data for experimentation.
vtkExtractGrid extract
extract SetVOI 1 55 -1000 1000 -1000 1000
extract SetInput [pl3d GetOutput]
# The (implicit) plane is used to do the cutting
vtkPlane plane
plane SetOrigin 0 4 2
plane SetNormal 0 1 0
# The cutter is set up to process each contour value over all cells
# (SetSortByToSortByCell). This results in an ordered output of polygons
# which is key to the compositing.
vtkCutter cutter
cutter SetInput [extract GetOutput]
cutter SetCutFunction plane
cutter GenerateCutScalarsOff
cutter SetSortByToSortByCell
vtkLookupTable clut
clut SetHueRange 0 .67
clut Build
vtkPolyDataMapper cutterMapper
cutterMapper SetInput [cutter GetOutput]
cutterMapper SetScalarRange .18 .7
cutterMapper SetLookupTable clut
vtkActor cut
cut SetMapper cutterMapper
# Add in some surface geometry for interest.
vtkContourFilter iso
iso SetInput [pl3d GetOutput]
iso SetValue 0 .22
vtkPolyDataNormals normals
normals SetInput [iso GetOutput]
normals SetFeatureAngle 45
vtkPolyDataMapper isoMapper
isoMapper SetInput [normals GetOutput]
isoMapper ScalarVisibilityOff
vtkActor isoActor
isoActor SetMapper isoMapper
eval [isoActor GetProperty] SetDiffuseColor $tomato
eval [isoActor GetProperty] SetSpecularColor $white
eval [isoActor GetProperty] SetDiffuse .8
eval [isoActor GetProperty] SetSpecular .5
eval [isoActor GetProperty] SetSpecularPower 30
vtkStructuredGridOutlineFilter outline
outline SetInput [pl3d GetOutput]
vtkTubeFilter outlineTubes
outlineTubes SetInput [outline GetOutput]
outlineTubes SetRadius .1
vtkPolyDataMapper outlineMapper
outlineMapper SetInput [outlineTubes GetOutput]
vtkActor outlineActor
outlineActor SetMapper outlineMapper
# Create the RenderWindow, Renderer and Interactor
vtkRenderer ren1
vtkRenderWindow renWin
renWin AddRenderer ren1
vtkRenderWindowInteractor iren
iren SetRenderWindow renWin
# Add the actors to the renderer, set the background and size
ren1 AddActor outlineActor
eval [outlineActor GetProperty] SetColor $banana
ren1 AddActor isoActor
isoActor VisibilityOn
ren1 AddActor cut
set opacity .1
[cut GetProperty] SetOpacity 1
ren1 SetBackground 1 1 1
renWin SetSize 640 480
set cam1 [ren1 GetActiveCamera]
$cam1 SetClippingRange 3.95297 50
$cam1 SetFocalPoint 9.71821 0.458166 29.3999
$cam1 SetPosition 2.7439 -37.3196 38.7167
$cam1 ComputeViewPlaneNormal
$cam1 SetViewUp -0.16123 0.264271 0.950876
# render the image
iren AddObserver UserEvent {wm deiconify .vtkInteract}
# Cut: generates n cut planes normal to camera's view plane
proc Cut {n} {
global cam1 opacity
eval plane SetNormal [$cam1 GetViewPlaneNormal]
eval plane SetOrigin [$cam1 GetFocalPoint]
eval cutter GenerateValues $n -5 5
clut SetAlphaRange $opacity $opacity
renWin Render
# Generate 10 cut planes
Cut 20
# prevent the tk window from showing up then start the event loop
wm withdraw .
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